Photocurrents at polmeric triads: sensitized redox cascades under forward and reverse bias

Abstract

The anodic photocurrents at the ‘isomeric’ redox-polymer trilayer-film assemblies, {electrode(–0.2 V)/redox₁(–0.42 V)/redox₂(–0.64 V)/sensitizer(–0.81 V)} and {electrode(–0.2 V)/redox₂(–0.64 V)/redox₁(–0.42 V)/sensitizer(–0.81 V)}(redox_1,2= polymeric diquat homologues, sensitizer = polymeric Ru(bpy)₃-derivative), are mainly governed by the sequence of redox₁ and redox₂, i.e. the forward or reverse bias of the intrinsic redox-type diode.